<?php
//**************************************************************************
//
//            (C) Okulov Rostislav, 2011
//
//**************************************************************************

/*
 ***************************************************************************
 *                                                                         *
 *   This source is free software; you can redistribute it and/or modify   *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   This code is distributed in the hope that it will be useful, but      *
 *   WITHOUT ANY WARRANTY; without even the implied warranty of            *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU     *
 *   General Public License for more details.                              *
 *                                                                         *
 *   A copy of the GNU General Public License is available on the World    *
 *   Wide Web at <http://www.gnu.org/copyleft/gpl.html>. You can also      *
 *   obtain it by writing to the Free Software Foundation,                 *
 *   Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.        *
 *                                                                         *
 */
 
    /* Module creates background for captcha from png file, 
       then it generates letters and numbers from time plus md5 functions
       and put result on a picture */

    session_start();

    $rnd_string = md5(microtime() * mktime());
    $string = substr($rnd_string,0,5);

    $captcha = imagecreatefrompng("captcha.png");
    $black = imagecolorallocate($captcha, 44, 2, 255);
    $line = imagecolorallocate($captcha,233,239,239);
    imagestring($captcha, 5, 40, 10, $string, $black);

    $_SESSION['key'] = md5($string);

    header("Content-type: image/png");

    imagepng($captcha);
?>
